/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.iotdb.commons.partition;

import org.apache.iotdb.common.rpc.thrift.TRegionReplicaSet;
import org.apache.iotdb.common.rpc.thrift.TSeriesPartitionSlot;
import org.apache.iotdb.commons.exception.IoTDBException;
import org.apache.iotdb.commons.utils.PathUtils;
import org.apache.iotdb.rpc.TSStatusCode;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

// TODO: Remove this class
public class SchemaPartition extends Partition {

    // Map<StorageGroup, Map<TSeriesPartitionSlot, TSchemaRegionPlaceInfo>>
    private Map<String, Map<TSeriesPartitionSlot, TRegionReplicaSet>> schemaPartitionMap;

    public SchemaPartition(String seriesSlotExecutorName, int seriesPartitionSlotNum) {
        super(seriesSlotExecutorName, seriesPartitionSlotNum);
    }

    @Override
    public boolean isEmpty() {
        return schemaPartitionMap == null || schemaPartitionMap.isEmpty();
    }

    public SchemaPartition(
            Map<String, Map<TSeriesPartitionSlot, TRegionReplicaSet>> schemaPartitionMap,
            String seriesSlotExecutorName,
            int seriesPartitionSlotNum) {
        this(seriesSlotExecutorName, seriesPartitionSlotNum);
        this.schemaPartitionMap = schemaPartitionMap;
    }

    public Map<String, Map<TSeriesPartitionSlot, TRegionReplicaSet>> getSchemaPartitionMap() {
        return schemaPartitionMap;
    }

    public void setSchemaPartitionMap(
            Map<String, Map<TSeriesPartitionSlot, TRegionReplicaSet>> schemaPartitionMap) {
        this.schemaPartitionMap = schemaPartitionMap;
    }

    public TRegionReplicaSet getSchemaRegionReplicaSet(String deviceName) {
        // A list of data region replica sets will store data in a same time partition.
        // We will insert data to the last set in the list.
        // TODO return the latest dataRegionReplicaSet for each time partition
        String storageGroup = getStorageGroupByDevice(deviceName);
        TSeriesPartitionSlot seriesPartitionSlot = calculateDeviceGroupId(deviceName);
        if (schemaPartitionMap.get(storageGroup) == null) {
            throw new RuntimeException(
                    new IoTDBException("Path does not exist. ", TSStatusCode.PATH_NOT_EXIST.getStatusCode()));
        }
        return schemaPartitionMap.get(storageGroup).get(seriesPartitionSlot);
    }

    private String getStorageGroupByDevice(String deviceName) {
        for (String storageGroup : schemaPartitionMap.keySet()) {
            if (PathUtils.isStartWith(deviceName, storageGroup)) {
                return storageGroup;
            }
        }
        // TODO: (xingtanzjr) how to handle this exception in IoTDB
        return null;
    }

    @Override
    public List<RegionReplicaSetInfo> getDistributionInfo() {
        Map<TRegionReplicaSet, RegionReplicaSetInfo> distributionMap = new HashMap<>();
        schemaPartitionMap.forEach(
                (storageGroup, partition) -> {
                    for (TRegionReplicaSet regionReplicaSet : partition.values()) {
                        distributionMap
                                .computeIfAbsent(regionReplicaSet, RegionReplicaSetInfo::new)
                                .setStorageGroup(storageGroup);
                    }
                });
        return new ArrayList<>(distributionMap.values());
    }
}
